低温熔盐中钛铝合金电解脱铝的研究

徐培栋; 谭敏; 李涛; 高爱民; 辛朝阳; 刘伟; 谷少鹏

doi:10.7513/j.issn.1004-7638.2023.04.012

低温熔盐中钛铝合金电解脱铝的研究

doi: 10.7513/j.issn.1004-7638.2023.04.012

华北理工大学冶金与能源学院, 河北唐山 063210

基金项目: 国家自然科学基金面上项目（No.52074056）; 唐山市科技创新团队培养计划项目（21130209D）; 唐山市科技计划项目（22130222H）

详细信息

作者简介:
徐培栋，2000年出生，男，河南许昌人，硕士研究生，主要研究方向为钛铝合金回收利用，E-mail：15530866563@163.com

通讯作者:
李涛，1984年出生，男，河北邢台人，教授，主要研究方向为铝电解工艺研究，E-mail: litao@ncst.edu.cn

中图分类号: TG146.2,TQ151
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出版历程
- 收稿日期: 2022-12-26
- 刊出日期: 2023-08-30

Study on electrical removal of aluminum from Ti-Al alloys in low-temperature molten salt

College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China

摘要

摘要: 为实现钛铝合金的二次回收与分离利用，以钛铝合金为牺牲阳极，1-丁基-3-甲基咪唑氯铝酸盐（BMIC-AlCl₃）作为电解液，进行钛铝合金的脱合金化研究。采用循环伏安曲线、动电位极化和恒电位极化对电解过程的脱合金行为进行电化学分析；使用SEM对电解前后样品微区形貌进行表征，使用ICP-AES对电解前后钛铝合金样品中的Al含量进行定量分析。结果表明，钛铝合金在BMIC-AlCl₃中的脱合金反应为准可逆反应，且长时间电解过程中电流保持稳定，可实现持续电解脱铝；通过扫描电子显微镜发现阴极沉积层为纯度较高且呈现多孔结构的金属铝。ICP-AES对电解前后的钛铝合金中Al元素含量的分析结果表明，电解后钛铝合金中Al元素含量相对于电解前下降10.67%。
- 钛铝合金 /
- 离子液体 /
- 脱合金化 /
- 电化学分析 /
- 铝含量
Abstract: In order to realize the secondary recycling and separation of Al-Ti alloys, the dealloying of Al-Ti alloys was studied with 1-butyl-3-methyl imidazolium chloride (BMIC)-aluminum chloride (AlCl₃) as the electrolyte and Ti-Al alloys as the sacrificial anode. Cyclic voltammetry, potentiodynamic polarization method, and potentiostatic polarization method were performed to analyze the dealloying behavior during electrolysis. SEM-EDS was used to characterize the micromorphology of the samples before and after electrolysis. The Al content in the Ti-Al alloy samples was quantified by ICP-AES. The results showed that the dealloying reaction of Ti-Al alloy in BMIC-AlCl₃ is quasi-reversible. The current remains stable during the long-time electrolysis, indicating that the electrolytic dealloying could be achieved continuously. The cathodic deposition layer was found to be metallic aluminum with high purity and porous structure by scanning electron microscopy. The content of Al in titanium aluminum alloy after electrolysis decreased by 10.67% compared with that before electrolysis based on the ICP-AES analysis.
- titanium aluminum alloy /
- ionic liquid /
- dealloying /
- electrochemical analysis /
- aluminum content

HTML全文

图 1 不同工作电极在BMIC-AlCl₃中的循环伏安曲线

(a)Pt片工作电极；(b)Al片工作电极；(c)Ti片工作电极；(d)钛铝合金工作电极

Figure 1. Cyclic voltammetry curves of different working electrodes in BMIC-AlCl₃

下载: 全尺寸图片幻灯片

图 2 BMIC-AlCl₃溶液中45 ℃时钛铝合金阳极极化曲线

Figure 2. Anode polarization curve of Ti-Al alloy at 45 ℃ in BMIC-AlCl₃ solution

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图 3 钛铝合金在不同电位下电解时的电流密度随时间变化曲线

Figure 3. The curve of current density with time during electrolysis of Ti-Al alloy at different potentials

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图 4 电解后阴极镀层形貌和能谱

Figure 4. Morphology and energy dispersive spectrum of cathode coating after electrolysis

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图 5 阴极镀层微观形貌及元素分布

Figure 5. Microstructure and element distribution of cathode coatings

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图 6 钛铝合金粉末的动态极化曲线

Figure 6. Dynamic polarization curves of Ti-Al alloy powder

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表 1 钛铝合金成分

Table 1. Ti-Al alloy composition %

Ti Al O

37.61 61.19 1.2

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